All SCUBA cylinders require a yearly Visual inspection to check for cracks and other defects and every 2 years a Hydrostatic test (hydrostatic) which tests for metal fatigue and Visual inspection.
Dive HQ Whangarei is an EPA (Environmental Protection Agency) Certified Cylinder Test Laboratory under the New Zealand Underwater SCAP (Scuba Cylinder Audit Programme) covering Scuba, BA and Paint Ball cylinders.
In August 2017, some older types of Aluminium cylinders were deemed unsafe and removed from service by Worksafe due to the alloy used. These are tanks that are over 25 years old. There have been catastrophic failures of these tanks worldwide at the filling stage that have resulted in the death and serious maiming of dive shop staff.